/**
 * @license  Highcharts JS v6.1.2 (2018-08-31)
 *
 * Indicator series type for Highstock
 *
 * (c) 2010-2017 Paweł Fus
 *
 * License: www.highcharts.com/license
 */
'use strict';
(function (factory) {
	if (typeof module === 'object' && module.exports) {
		module.exports = factory;
	} else if (typeof define === 'function' && define.amd) {
		define(function () {
			return factory;
		});
	} else {
		factory(Highcharts);
	}
}(function (Highcharts) {
	(function (H) {


		var each = H.each,
		    merge = H.merge,
		    isArray = H.isArray,
		    defined = H.defined,
		    SMA = H.seriesTypes.sma;

		// Utils:
		function minInArray(arr, index) {
		    return H.reduce(arr, function (min, target) {
		        return Math.min(min, target[index]);
		    }, Infinity);
		}

		function maxInArray(arr, index) {
		    return H.reduce(arr, function (min, target) {
		        return Math.max(min, target[index]);
		    }, 0);
		}

		H.seriesType('stochastic', 'sma',
		    /**
		     * Stochastic oscillator. This series requires the `linkedTo` option to be
		     * set and should be loaded after the `stock/indicators/indicators.js` file.
		     *
		     * @extends plotOptions.sma
		     * @product highstock
		     * @sample {highstock} stock/indicators/stochastic
		     *                     Stochastic oscillator
		     * @since 6.0.0
		     * @optionparent plotOptions.stochastic
		     */
		    {
		        name: 'Stochastic (14, 3)',
		        /**
		         * @excluding index,period
		         */
		        params: {
		            /**
		             * Periods for Stochastic oscillator: [%K, %D].
		             *
		             * @default [14, 3]
		             * @type {Array}
		             * @since 6.0.0
		             * @product highstock
		             */
		            periods: [14, 3]
		        },
		        marker: {
		            enabled: false
		        },
		        tooltip: {
		            pointFormat: '<span style="color:{point.color}">\u25CF</span><b> {series.name}</b><br/>%K: {point.y}<br/>%D: {point.smoothed}<br/>'
		        },
		        /**
		         * Smoothed line options.
		         *
		         * @since 6.0.0
		         * @product highstock
		         */
		        smoothedLine: {
		            /**
		             * Styles for a smoothed line.
		             *
		             * @since 6.0.0
		             * @product highstock
		             */
		            styles: {
		                /**
		                 * Pixel width of the line.
		                 *
		                 * @type {Number}
		                 * @since 6.0.0
		                 * @product highstock
		                 */
		                lineWidth: 1,
		                /**
		                 * Color of the line. If not set, it's inherited from
		                 * [plotOptions.stochastic.color](
		                 * #plotOptions.stochastic.color).
		                 *
		                 * @type {String}
		                 * @since 6.0.0
		                 * @product highstock
		                 */
		                lineColor: undefined
		            }
		        },
		        dataGrouping: {
		            approximation: 'averages'
		        }
		    }, /** @lends Highcharts.Series.prototype */ {
		        nameComponents: ['periods'],
		        nameBase: 'Stochastic',
		        pointArrayMap: ['y', 'smoothed'],
		        parallelArrays: ['x', 'y', 'smoothed'],
		        pointValKey: 'y',
		        init: function () {
		            SMA.prototype.init.apply(this, arguments);

		            // Set default color for lines:
		            this.options = merge({
		                smoothedLine: {
		                    styles: {
		                        lineColor: this.color
		                    }
		                }
		            }, this.options);
		        },
		        toYData: function (point) {
		            return [point.y, point.smoothed];
		        },
		        translate: function () {
		            var indicator = this;

		            SMA.prototype.translate.apply(indicator);

		            each(indicator.points, function (point) {
		                if (point.smoothed !== null) {
		                    point.plotSmoothed = indicator.yAxis.toPixels(
		                        point.smoothed,
		                        true
		                    );
		                }
		            });
		        },
		        drawGraph: function () {
		            var indicator = this,
		                mainLinePoints = indicator.points,
		                pointsLength = mainLinePoints.length,
		                mainLineOptions = indicator.options,
		                mainLinePath = indicator.graph,
		                gappedExtend = {
		                    options: {
		                        gapSize: mainLineOptions.gapSize
		                    }
		                },
		                smoothing = [],
		                point;

		            // Generate points for %K and %D lines:
		            while (pointsLength--) {
		                point = mainLinePoints[pointsLength];
		                smoothing.push({
		                    plotX: point.plotX,
		                    plotY: point.plotSmoothed,
		                    isNull: !defined(point.plotSmoothed)
		                });
		            }

		            // Modify options and generate smoothing line:
		            indicator.points = smoothing;
		            indicator.options = merge(
		                mainLineOptions.smoothedLine.styles,
		                gappedExtend
		            );
		            indicator.graph = indicator.graphSmoothed;
		            SMA.prototype.drawGraph.call(indicator);
		            indicator.graphSmoothed = indicator.graph;

		            // Restore options and draw a main line:
		            indicator.points = mainLinePoints;
		            indicator.options = mainLineOptions;
		            indicator.graph = mainLinePath;
		            SMA.prototype.drawGraph.call(indicator);
		        },
		        getValues: function (series, params) {
		            var periodK = params.periods[0],
		                periodD = params.periods[1],
		                xVal = series.xData,
		                yVal = series.yData,
		                yValLen = yVal ? yVal.length : 0,
		                SO = [], // 0- date, 1-%K, 2-%D
		                xData = [],
		                yData = [],
		                slicedY,
		                close = 3,
		                low = 2,
		                high = 1,
		                CL, HL, LL, K,
		                D = null,
		                points,
		                i;


		            // Stochastic requires close value
		            if (
		                xVal.length < periodK ||
		                !isArray(yVal[0]) ||
		                yVal[0].length !== 4
		            ) {
		                return false;
		            }

		            // For a N-period, we start from N-1 point, to calculate Nth point
		            // That is why we later need to comprehend slice() elements list
		            // with (+1)
		            for (i = periodK - 1; i < yValLen; i++) {
		                slicedY = yVal.slice(i - periodK + 1, i + 1);

		                // Calculate %K
		                LL = minInArray(slicedY, low); // Lowest low in %K periods
		                CL = yVal[i][close] - LL;
		                HL = maxInArray(slicedY, high) - LL;
		                K = CL / HL * 100;

		                // Calculate smoothed %D, which is SMA of %K
		                if (i >= periodK + periodD) {
		                    points = SMA.prototype.getValues.call(this, {
		                        xData: xData.slice(i - periodD - periodK, i - periodD),
		                        yData: yData.slice(i - periodD - periodK, i - periodD)
		                    }, {
		                        period: periodD
		                    });
		                    D = points.yData[0];
		                }

		                SO.push([xVal[i], K, D]);
		                xData.push(xVal[i]);
		                yData.push([K, D]);
		            }

		            return {
		                values: SO,
		                xData: xData,
		                yData: yData
		            };
		        }
		    }
		);

		/**
		 * A Stochastic indicator. If the [type](#series.stochastic.type) option is not
		 * specified, it is inherited from [chart.type](#chart.type).
		 *
		 * @type {Object}
		 * @since 6.0.0
		 * @extends series,plotOptions.stochastic
		 * @excluding data,dataParser,dataURL
		 * @product highstock
		 * @apioption series.stochastic
		 */

		/**
		 * An array of data points for the series. For the `stochastic` series type,
		 * points are calculated dynamically.
		 *
		 * @type {Array<Object|Array>}
		 * @since 6.0.0
		 * @extends series.line.data
		 * @product highstock
		 * @apioption series.stochastic.data
		 */


	}(Highcharts));
	return (function () {


	}());
}));
